Java Requires Chilkat v11.7.0+

Tile a Watermark Across a PDF Page

See more PDF Watermark Examples

Demonstrates a tiled watermark, which repeats the stamp over the whole page instead of placing it once. Tiling overrides position.align; tile.spacingX and spacingY set the gaps, and tile.stagger offsets alternate rows by half a tile so the pattern does not line up in columns. A faint tiled stamp carrying the name or address is the usual way to mark a document so that a leaked copy can be traced back, and zOrder back keeps it behind the text where it does not hinder reading. Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.JsonObject;
import com.chilkatsoft.chilkat2.Pdf;

public class ChilkatExample {

    public static void main(String[] args) {
        // This example requires the Chilkat API to have been previously unlocked.
        // See Global Unlock Sample for sample code.

        // The PDF used in this example is available at long_report.pdf

        Pdf pdf = new Pdf();
        try {
            pdf.loadFile("qa_data/pdf/long_report.pdf");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        JsonObject json = new JsonObject();
        json.updateString("type", "text");

        // {date:FORMAT} is replaced per page when the watermark is added.  The other placeholders are
        // {page}, {pages} and {filename}; {{ gives a literal brace.
        json.updateString("text", "jdoe@example.com  {date:yyyy-MM-dd}");
        json.updateString("id", "trace");
        json.updateString("zOrder", "back");
        json.updateNumber("font.size", "14");
        json.updateNumber("opacity", "0.15");
        json.updateNumber("rotation", "30");

        json.updateBool("tile.enabled", true);
        json.updateNumber("tile.spacingX", "60");
        json.updateNumber("tile.spacingY", "80");
        json.updateBool("tile.stagger", true);

        JsonObject jsonOut = new JsonObject();
        try {
            pdf.watermark("add", json, jsonOut);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        System.out.println("id: " + jsonOut.stringOf("id") + " pages: " + jsonOut.stringOf("pages"));

        try {
            pdf.writeFile("qa_output/report_traced.pdf");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Sample output:

        // id: trace pages: 1-3
    }
}